Yesterday I stopped by my bodyshop to see if they had any suggestions, as I had a similar problem in that there was a slight lip on the drivers side. The manager pointed out that my car's lines on the sides were perfect it was just a slight lip above the driver's side headlight. When he pulled on the bumper cover slightly the lines were perfect. He pointed out that the height was perfect all around and therefore I shouldn't try adjusting the height of anything. Try this or check your headlights to make sure they are correct. I was also told that a badly aligned headlight may make it look as if the hood is uneven.
Joe